123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291 |
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - custom attributes [particles][billboards]</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
- <link type="text/css" rel="stylesheet" href="main.css">
- </head>
- <body>
- <div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - custom attributes example - particles - billboards</div>
- <div id="container"></div>
- <script type="x-shader/x-vertex" id="vertexshader">
- attribute float size;
- attribute vec3 ca;
- varying vec3 vColor;
- void main() {
- vColor = ca;
- vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
- gl_PointSize = size * ( 300.0 / -mvPosition.z );
- gl_Position = projectionMatrix * mvPosition;
- }
- </script>
- <script type="x-shader/x-fragment" id="fragmentshader">
- uniform vec3 color;
- uniform sampler2D pointTexture;
- varying vec3 vColor;
- void main() {
- vec4 color = vec4( color * vColor, 1.0 ) * texture2D( pointTexture, gl_PointCoord );
- gl_FragColor = color;
- }
- </script>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import Stats from 'three/addons/libs/stats.module.js';
- import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
- let renderer, scene, camera, stats;
- let sphere, length1;
- const WIDTH = window.innerWidth;
- const HEIGHT = window.innerHeight;
- init();
- function init() {
- camera = new THREE.PerspectiveCamera( 45, WIDTH / HEIGHT, 1, 10000 );
- camera.position.z = 300;
- scene = new THREE.Scene();
- const radius = 100, segments = 68, rings = 38;
- let sphereGeometry = new THREE.SphereGeometry( radius, segments, rings );
- let boxGeometry = new THREE.BoxGeometry( 0.8 * radius, 0.8 * radius, 0.8 * radius, 10, 10, 10 );
- // if normal and uv attributes are not removed, mergeVertices() can't consolidate identical vertices with different normal/uv data
- sphereGeometry.deleteAttribute( 'normal' );
- sphereGeometry.deleteAttribute( 'uv' );
- boxGeometry.deleteAttribute( 'normal' );
- boxGeometry.deleteAttribute( 'uv' );
- sphereGeometry = BufferGeometryUtils.mergeVertices( sphereGeometry );
- boxGeometry = BufferGeometryUtils.mergeVertices( boxGeometry );
- const combinedGeometry = BufferGeometryUtils.mergeGeometries( [ sphereGeometry, boxGeometry ] );
- const positionAttribute = combinedGeometry.getAttribute( 'position' );
- const colors = [];
- const sizes = [];
- const color = new THREE.Color();
- const vertex = new THREE.Vector3();
- length1 = sphereGeometry.getAttribute( 'position' ).count;
- for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
- vertex.fromBufferAttribute( positionAttribute, i );
- if ( i < length1 ) {
- color.setHSL( 0.01 + 0.1 * ( i / length1 ), 0.99, ( vertex.y + radius ) / ( 4 * radius ) );
- } else {
- color.setHSL( 0.6, 0.75, 0.25 + vertex.y / ( 2 * radius ) );
- }
- color.toArray( colors, i * 3 );
- sizes[ i ] = i < length1 ? 10 : 40;
- }
- const geometry = new THREE.BufferGeometry();
- geometry.setAttribute( 'position', positionAttribute );
- geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ) );
- geometry.setAttribute( 'ca', new THREE.Float32BufferAttribute( colors, 3 ) );
- //
- const texture = new THREE.TextureLoader().load( 'textures/sprites/disc.png' );
- texture.wrapS = THREE.RepeatWrapping;
- texture.wrapT = THREE.RepeatWrapping;
- const material = new THREE.ShaderMaterial( {
- uniforms: {
- color: { value: new THREE.Color( 0xffffff ) },
- pointTexture: { value: texture }
- },
- vertexShader: document.getElementById( 'vertexshader' ).textContent,
- fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
- transparent: true
- } );
- //
- sphere = new THREE.Points( geometry, material );
- scene.add( sphere );
- //
- renderer = new THREE.WebGLRenderer();
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( WIDTH, HEIGHT );
- renderer.setAnimationLoop( animate );
- const container = document.getElementById( 'container' );
- container.appendChild( renderer.domElement );
- stats = new Stats();
- container.appendChild( stats.dom );
- //
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function sortPoints() {
- const vector = new THREE.Vector3();
- // Model View Projection matrix
- const matrix = new THREE.Matrix4();
- matrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
- matrix.multiply( sphere.matrixWorld );
- //
- const geometry = sphere.geometry;
- let index = geometry.getIndex();
- const positions = geometry.getAttribute( 'position' ).array;
- const length = positions.length / 3;
- if ( index === null ) {
- const array = new Uint16Array( length );
- for ( let i = 0; i < length; i ++ ) {
- array[ i ] = i;
- }
- index = new THREE.BufferAttribute( array, 1 );
- geometry.setIndex( index );
- }
- const sortArray = [];
- for ( let i = 0; i < length; i ++ ) {
- vector.fromArray( positions, i * 3 );
- vector.applyMatrix4( matrix );
- sortArray.push( [ vector.z, i ] );
- }
- function numericalSort( a, b ) {
- return b[ 0 ] - a[ 0 ];
- }
- sortArray.sort( numericalSort );
- const indices = index.array;
- for ( let i = 0; i < length; i ++ ) {
- indices[ i ] = sortArray[ i ][ 1 ];
- }
- geometry.index.needsUpdate = true;
- }
- function animate() {
- render();
- stats.update();
- }
- function render() {
- const time = Date.now() * 0.005;
- sphere.rotation.y = 0.02 * time;
- sphere.rotation.z = 0.02 * time;
- const geometry = sphere.geometry;
- const attributes = geometry.attributes;
- for ( let i = 0; i < attributes.size.array.length; i ++ ) {
- if ( i < length1 ) {
- attributes.size.array[ i ] = 16 + 12 * Math.sin( 0.1 * i + time );
- }
- }
- attributes.size.needsUpdate = true;
- sortPoints();
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
|